Mirror movement disable circuit for LED display in light finder

Details Mirror movement disable circuit for LED display in light finder Mirror movement disable circuit for LED display in light finder

1976-10-22

1978-05-30

Hix, L. T.

354 23D, 354 53, G03B 700, G03B 1720

Patent

active

040926532

ABSTRACT:
A circuit for disabling the LED display L1-L5 in the light meter of a single lens reflex camera in response to mirror movements. When the mirror 21 is raised the switch 17 is closed which reverse biases the LEDs. After the mirror is lowered the switch 17 is opened to enable the LEDs, but a short time delay is provided to allow transients to settle out by reason of a capacitor 18 which must first charge through a grounding resistor 19.

REFERENCES:
patent: 3988069 (1976-10-01), Kitaura et al.
patent: 3999191 (1976-12-01), Saito et al.

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